The purpose of this project was to design a PA loudspeaker that sounded good
enough even for high-end home cinema systems. First we experimented with a small
Eminence LH 170 F Horn. The result wasn't satisfactory. There were considerable
anomalies in the lower frequency range, independent of the driver used.

Therefore, we decided to use the RCF Horn H100.

This horn was then combined with an Eminence Delta 10 bass driver. Care had
to be taken to separate this bass driver from the tweeter by using two capacitors.
Distinct distortion develops from approx. 100 Watts onwards since the voice
coil leaves the linear range; However, this is quite advantageous for home
cinema considering that a comparable hi-fi speaker needs a 1000 Watt amplifier
to produce the same volume.

Frequency response

The following frequency response was measured with a calibrated Clio microphone.
The cabinet was not damped (for PA speakers that's common). For hi-fi we recommend
some napped foam for the rear wall and 1 pack of damping fleece.
Both drivers are in phase (the intersection of both lines is approx. 6 dB below
the total frequency curve); a bit annoying - but still in line with hi-fi requirements
- is the Delta 10's small unevenness at 2.7 kHz.